Electromagnetic Field Theory
Plane z = 10 m carries charge 20 C/m2. The electric field intensity at the origin is

 – 10 uz v/m.
  – 360 πuz v/m.
 – 72 πuz v/m.
 – 18 πuz v/m.

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Electromagnetic Field Theory
A long wire composed of a smooth round conductor runs above and parallel to the ground (assumed to be a large conducting plane). A high voltage exists between the conductor and the ground. The maximum electric stress occurs at

 the ground surface.
 lower surface of the conductor.
 upper surface of the conductor.
 midway between the conductor and ground.

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